Musescore 4 beta: Adding an extra staff to an instrument and then undoing it crashes the program

On the Musescore 4 beta release (installed on a Windows 10 PC), I opened a copy of an old project I had last edited in Musescore 3.6. To one of the seven instruments I added an additional staff to see if I could do split staff divisi with numbered staves. When couldn't find any options for that, I undid the addition of the extra staff using Ctrl-Z, and the program immediately froze and crashed. This applies to the addition of linked staves as well.